Delete row sig_9a8fc9b3ccff from signals

id sig_9a8fc9b3ccff
event_id evt_ebb229be0715
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_eb20875da ...
dedupe_key signal_enriched:news_delta:e53018c134bbcfa4
throttle_s 0
created_at 2026-04-08T06:36:01.028380+00:00
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